snippetbashTip

fstrim — Discard unused blocks on a mounted filesystem. Only supported by flash memory devices such as SSDs a

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandfstrimunusedmountedclidiscardfilesystemblocks

linux

Problem

How to use the fstrim command: Discard unused blocks on a mounted filesystem. Only supported by flash memory devices such as SSDs and microSD cards. More information: <https://manned.org/fstrim>.

Solution

fstrim — Discard unused blocks on a mounted filesystem. Only supported by flash memory devices such as SSDs and microSD cards. More information: <https://manned.org/fstrim>.

Trim unused blocks on all mounted partitions that support it:

sudo fstrim {{[-a|--all]}}

Trim unused blocks on a specified partition:

sudo fstrim {{/}}

Display statistics after trimming:

sudo fstrim {{[-v|--verbose]}} {{/}}

Code Snippets

Trim unused blocks on all mounted partitions that support it

sudo fstrim {{[-a|--all]}}

Trim unused blocks on a specified partition

sudo fstrim {{/}}

Display statistics after trimming

sudo fstrim {{[-v|--verbose]}} {{/}}

Context

tldr-pages: linux/fstrim

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